import { ByteArray } from '../types.js';
/**
 * Encodes a string as UTF-16BE with BOM for PDF
 *
 * PDF strings can use UTF-16BE encoding to represent Unicode characters.
 * The encoding must start with the UTF-16BE BOM (0xFE 0xFF) to be recognized.
 *
 * @param str - The string to encode
 * @returns Byte array with UTF-16BE BOM followed by the encoded string
 *
 * @example
 * ```typescript
 * encodeAsUTF16BE('PROSZĘ')
 * // Returns Uint8Array([0xFE, 0xFF, 0x00, 0x50, 0x00, 0x52, ...])
 * ```
 */
export declare function encodeAsUTF16BE(str: string): ByteArray;